Adjective ungrateful has 2 senses
  1. ungrateful, thankless, unthankful - not feeling or showing gratitude; "ungrateful heirs"; "How sharper than a serpent's tooth it is / To have a thankless child!"- Shakespeare
    Antonyms: grateful, thankful, appreciative, glad
  2. ungrateful - disagreeable; "I will not perform the ungrateful task of comparing cases of failure"- Abraham Lincoln
    Antonym:
    pleasant (indirect, via unpleasant)
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